vBulletin
7,250 websites

vBulletin costs money

http://www.vbulletin.com

vBulletin is a professional, affordable community forum solution. Thousands of clients, including many industry leading blue chip companies, have chosen vBulletin - It's the ideal choice for any size of community.

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Zendesk Knowledge Base
19,041 websites

Zendesk Knowledge Base costs money

https://www.zendesk.com/guide/features/knowledge-base-software/

Zendesk Knowledge Base allows you to create, organize, and share content easily with agents, select customers, or the public and measure what performs best.

Market Share by Top Websites

1 Zendesk Knowledge Base is leading in The Entire Web.

2 vBulletin is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Zendesk Knowledge Base has better usage coverage in more websites categories. Including Computers Electronics & Technology, Finance, Business & Consumer Services, Lifestyle and 16 other categories.

2 vBulletin is leading in Vehicles, Adult and News & Media.

Geography

1 Zendesk Knowledge Base is leading in most countries, including United States, United Kingdom, Japan, Germany and 96 other countries.

2 vBulletin is leading in Russia, Egypt, Vietnam, Saudi Arabia and 35 other countries.